Prizoop is a Game Boy and Game Boy Color emulator that is compatible with most popular titles. To install, just copy prizoop.g3a to the root of your Prizm, and any rom files you would like to play in the emulator the root as well (as .gb or .gbc files, with simple 8 character names).
You can also compress files using the included Windows tool as .gbz and save a bit of space in exchange for slightly slower emulation.
An embedded FAQ viewer is available that maintains your position in a text FAQ for each game. FAQ's are very readable thanks to calctype and sub-pixel text rendering. Simply include the FAQ as a ASCII encoded text file with the same name as your rom file but with a .txt extension.
Includes full sound support (using a 2.5 mm to 3.5 mm adaptor), and can run almost all games at full speed.
Source code and additional notes at the github: https://github.com/tswilliamson/prizoop